This is done by pumping fluid towards the bow, which pitches it down for a dive, or sending it towards the stern to point the nose up when ascending.

这通过将液体抽向船首来完成，这将使它的头部下沉，或者当上升时把液体抽向船尾让船首上翘。

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In heart failure, a weakly pumping heart allows fluid to build up until patients gasp for breath.

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The effort, called a "top kill, " involved plugging the ruptured deep-sea well by pumping heavy drilling fluid into it from the surface, nearly a mile above.

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The heart doesn't pump well, the body doesn't get enough oxygen, and it begins to retain fluid, which in turn makes pumping harder.

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